We begin this morning that the unrest -- an American city torn apart following that police involved shooting of a teenager the demonstrations turned violent Ferguson Missouri for a fourth straight night yes your gas stun grenades raining down on protesters there the police ordering them to disperse. The demonstrators returned fire with a Molotov cocktails ABC's to mom Bradley has the very latest. Another night of violent protests -- Ferguson Missouri tensions still simmering. Days after a police officer shot and killed an unarmed black teenager last Saturday. Demonstrators threw Molotov cocktails and other objects -- police. Officers responded firing tear gas where you in the front line up their. Eyes and -- just assumed. While some of the nighttime protests have gotten out of hand. During the day peaceful demonstrators raised their arms chanting hands up don't shoot. That surrender sign now a symbol so many people's anger. This -- I assume -- the chief of police is trying to turn the temperature down he meets with the family of Michael Brown today. But with death threats coming in the chief is refusing to identify the officer who shot and killed the eighteen year old. For now all the -- will say is that the officer was injured. Is -- was swollen so we need usually. They -- or punch or something like that the Saint Louis county prosecutors promising a full investigation. The FBI opened that civil rights inquiry. Two thirds of Ferguson's residents are black the virtually all white police force is now working with the Justice Department on community relations. Yvonne Bradley ABC news Washington.

This transcript has been automatically generated and may not be 100% accurate.

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